He fought Joe Frazier for the Heavyweight Championship of the world in 1969 (I think it was in 69)... I was actually in attendance at that fight...
This is the only world heavyweight championship fight (okay, light heavy) that I've ever been to. Madison Square Gardens in '08
It was nice to see Roy again in the fight against Tyson the other day. Iron Mike looked okay (especially for his age) but you could tell that Roy hadn't trained much, wasn't taking it overly seriously and was just there for the payday.